Atomic Theory and Structure

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by morgansullivan07
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Atomic Theory and Structure

470-320 B.C



John Dalton


J.J Thomson



Erenest Rutherford

Neils Bohr

Alexandra, Melanie, Morgan

Proved that atoms are mostly empty space, and electrons circle the nucleusDiscovered the nucleus which contains positiveley charged particles

Said that electrons move in different orbits

First scientist to propose the plum pudding model(negatively charged electrons are in a sea of positive charges

Atomic Theory and Structure

In 1922, Bohr was awarded the Nobel Prize in Physics

(British) Proposed existence of atomsHe described them as invisible, indestructible, and like a solid sphere

Gold Foil Experiment Conclusion: The nuclear atom is a structure with a positively charged nucleus of high density and negatively charged electron particles moving around it at relatively large distances compared to the nuclear radius

Cathode Ray Tube: vacuum tube containing one or more electron guns and a fluorescent screen used to view images

An atom is a basic unit of matter that consists of a dense central nucleus surrounded by a cloud of negatively charged electrons.

Dalton Postulates1. All matter consists of tiny particles2. Atoms are indestructible and unchangeable.3. Elements are characterized by the mass of their atoms.4. When elements react, their atoms combine in simple, whole-number ratios.

He was a pre-Socratic Greek philosopher. He is popularly known as "the laughing philosopher"

Proposed that matter can't be broken down__He called the smallest piece an atom, which means invisible

Marie Curie


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